Chin guard



FIG. 1 is a perspective view of a chin guard showing our new design;

FIG. 2 is another perspective view thereof attached to a visor, wherein the visor is attached to a visor frame of a helmet, and wherein the visor, visor frame and helmet are shown in broken lines that form no part of the claimed design;

FIG. 3 is a front view thereof;

FIG. 4 is a side view thereof, the opposite side view is identical;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

All surfaces not shown form no part of the claimed design. 

The ornamental design for a chin guard, as shown and described. 